I'm having trouble making sense of addition and subtraction in trig identities.

cos^6x + sin^6x = 1 - 3 sin^2x + 3 sin^4x

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- Apr 23rd 2009, 03:19 PMcasey_kProving Trig Identities
I'm having trouble making sense of addition and subtraction in trig identities.

cos^6x + sin^6x = 1 - 3 sin^2x + 3 sin^4x - Apr 23rd 2009, 03:49 PMProve It
- Apr 23rd 2009, 03:51 PMskeeter
- Apr 23rd 2009, 05:13 PMcasey_k
I didn't get it at first because I expanded the right side both (cos^2x)^3 + (sin^2x)^3 but then I realized I only had to expand cos.

Thank you!